Moses g



(No Model.)

M. G. PARMBR.

TELEGRAPH SYSTEM.

- No. 349,214. Patented Sept. 14, 1886.

Witviwwo NITED STATES PATENT OFFICE.

MOSES G. FARMER, OF NE\V YORK, N. Y.

TELEGRAPH SYSTEM.

SPECEPICATIQN forming part of Letters Patent No. 349,214, datedSeptember 14, 1886.

Application filed June 11, 1886.

' ing a part of the same.

My invention is embodied in a system or.

combination of instruments and electric circuits for sending andreceiving telegraphic signals by means of induced or secondary currents.

The improvements which constitute my invention are a novel arrangementof circuits, whereby a great saving of batte1ry powe1.' is

effected, and the combination therewith of a circuit-closer'and acircuit-reverser, by means of which the working of a line is greatlfacilitated.

One of the methods of operating a telegraphic line heretofore practicedhas been to use an induction-coil at each terminal, the primary coil ofeach induction-coil being included in a local circuit with a battery andthe secondary coil in the main line. To: produce the signaling-currents,the direction of the current in one of the primaries was reversed bymeans of a key, and a corresponding current impulse thereby induced inthe secondary coil and main line. The manipulation of acircuit-reversing key, however, is attended with difficulty, and opposesan obstacle to the practical working of such a system.

One of the main objects of my invention is to obviate this difficulty,and I do this by using an ordin ar y make-an d-break key in conjunctionwith an electrically controlled reverser, by means of whichthe operationof reversing the current through the induction-coil is performed by abattery, and not directly by the hand of the operator. In applying thiscombination I use but one battery for operating the receiver, thereverser, and the induction-coil, dividing the circuit from such batteryinto three branches, in the manner hereinafter set forth. I also usesuch switches and other instruments as are necessary for the successfuloperation of the system, the details of the construction and mode ofoperation of which will be more fully understood by reference to theaccompanying drawing.

Serial No. 204,835. (No model.)

The figure is a diagram showing my improved arrangement of circuits andthe relations of the several instruments used in con j unctiontherewith.

A is the main or signaling line extending between two or more stations.

B is the primary of the induction-coil at one of .the stations orterminals, and C the secondary of the same. The main circuit branches atthe induction-coil, one branch including the secondary and going toground at D, the other branch leading to'a switch-key, E, thecontactplate of which is grounded at D. In the main line is a polarizedrelay, F.

The reverser which is used consists of an eleetro-magnet, G, in face ofthe pole of which is a spring-actuated vibrating armature, H. The freeend of this armature is provided with contact-points a a, situatedbetween contacts I) 0, carried by two spring-actuated levers, K L.Between other contacts, (I e, on these two levers K L is a pair ofstationary contacts, f g, and these parts are so related that when thearmature H'is moved slightly toward the magnet the contacts 0 a and d fare brought to gethcr and the others separated; or, when. the movementis in the opposite direction the contacts b a and g e are broughttogether and the others separated.

M is the battery. Its circuit is divided into three branches. One,formed by the wires in n 0, includes the magnet G and an ordinarycircuit-closing key, 0. Another, formed by wires on p n, includes thesounder or other form of receiver, and is partly through the frame andarmature-lever of the polarized relay. The third branch is formed bywires or tto the armature H of the magnet G, from whence it extendsthrough the primary of the induction-coil by wire 8 and back to the battery by the wire w, the switclrkcy P, and wire n. At the other terminalor station arethe same devices arranged in the same manner as hereshown.

' The operation of the system is as follows: In order to transmitsignals by means of the key 0, the switch-key E is opened, so that theline or main circuit is grounded through the sec ondary of thel11(lll(5ll0]l00ll. The switch-key P, on the other hand, is closed, soas to bring the contacts f 9 into connection with the battery. The key 0is then operated to make and break the circuit through the magnet G. Onclosing the branch including this magnet the armature H is attracted toward the magnet and a current sent through the primary of theinductioircoil. This induces a current on the line which operates thepolarized relays at the sending as well as the receiving stations. Onraising the key' 0 the circuit through the magnet G is interrupted, acurrent-impulse of opposite direction to the first is sent through theprimary of the induction-coil by the reaction of the armature H, and therelay-armatures shifted to their original position. When not sending bykey 0, the operator closes this key E, so to as short-cirmiit theprimary of the induction-coil, and opens key 1. Currentimpulses comingon the line operate the polarized relay and the recciving-instrumentinthe usual way.

The invention is obviously not limited to any specific form of theseveral instruments described, as any others that perform the samefunctions may be used.

\Vhat I claim is 1. In a system for tclcgraphing by induction, thecombination, with an induction-coil, of a circuit-closing key and aneleetro magneticrevcrseroperated bythekcy for reversing the circuitthrough the primary ot' the induc (ion-coil, as herein set forth.

2. In a system for telegraphing by induction, the combination, with aninduction-coil, of an electromagnetic reverser and a circuit closing keyarranged in branches of the same circuit, in the manner set forth.

3. In a system for telegraphing by inducti on, the combination, with aninduction-coil, ol

one branch including the clcctro-magnct ot' a circuit-revcrscr and acircuit-closing key, another branch including the primary ot' theillduetion-coil and the circuit-reversing devices, and the third branchthe receiving-instrument and the controlling or circuit-closing portionsof the relay, all as set forth.

MOSES G. FARMER. \Vi t n esscs GEO. F. Knnrn, T1310. DAME.

